Error parsing "1916apr23"

[ralacroix]

However "1916apr22" and "1916apr24" parse correctly. What is so special about "1916apr23"?

This problem affects every version of Date:Manip that I checked, on 5 distinct systems.

Date::Manip 6.76 (Debian 10, perl v5.28.1) Date::Manip 6.60 (Red Hat Enterprise Linux 8.5, perl v5.26.3; and also CentOS Linux 8, perl v5.26.3) Date::Manip 6.41 (CentOS Linux 7, perl v5.16.3) Date::Manip 6.24 (Red Hat Enterprise Linux 6.10, perl v5.10.1).

[SBECK-github]

It works fine for me:

############################

!/usr/bin/perl -w

use Date::Manip::Date; $d = new Date::Manip::Date;

$d->parse('1916apr22'); print $i = $d->value(),"\n";

$d->parse('1916apr23'); print $i = $d->value(),"\n";

$d->parse('1916apr24'); print $i = $d->value(),"\n"; ##########################

produces:

1916042200:00:00 1916042300:00:00 1916042400:00:00

Can you give me a script where it fails?

[ralacroix]

I get your result if I change the system timezone, for example with timedatectl set-timezone America/Toronto With the system timezone set to America/Winnipeg, your code produces the following output:

1916042200:00:00

1916042400:00:00

The value for 1916apr23 is a zero-length string. The call to parse() returns an error code of 1 for that date, and 0 for the dates that worked.

[SBECK-github]

If you do the following:

##################

!/usr/bin/perl -w

use Date::Manip::Date; $d = new Date::Manip::Date; $d->config('setdate','now,America/Winnipeg');

$d->parse('1916apr23'); print $i = $d->value(),"\n"; print $d->err(); ####################

you get:

[parse] Invalid date in timezone

and sure enough, on 1916-04-22 23:59:59 the time jumped forward (that is the date that daylight saving time was introduced there), so there was no date 1916-04-23 00:00:00 (which is the date you are parsing).

So, perfectly correct (though unexpected) behavior.